朝貢 ちょうこう貿易 ぼうえきではありませんでした
chōkōbōekidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 朝貢貿易

1. Was not tributary trade.; Was not a tributary trade relationship.

Past/Perfective
Negative
Polite
Formal Register